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Each activity begins with a carefully structured statement, such as "An invisible person is running. The person's clothes and shoes are not invisible. How would that look?" The children must process information, formulate a visual idea and then draw it on their own paper. "How Would That Look?" encourages visualization...
The Aleut People The seal hunters of the Pribilof and Commander islands are descendants of a great maritime race of Aleuts who settled along the Aleutian archipelago, a 1,300-km chain of islands extending southwest of the Alaskan mainland. Russians called them Aleut, but their own name is Unangan, meaning "the coast" o...
CARBON nanotubes have been bonded to the molecular backbone of a polymer for the first time. The feat could one day lead to a new generation of tough, lightweight composites for use in cars and aircraft. Because carbon nanotubes are 30 times stronger than steel yet five times less dense, chemists have been keen to use ...
What did they know - and not know Nebraska was a great mystery to most potential emigrants when it became open to settlement in the 1850's and to homesteading in the 1860's. Many Europeans and eastern Americans felt drawn to the west, but had limited access to accurate information about areas such as Nebraska. What the...
Social Learning Theory Social Learning Theory A theory, first proposed in the late 1960s, which posits that children learn through a process of interactions with their environments and their caregivers. In the early 1960s, researchers who had become disillusioned with the radical behaviorism of theorists like B.F. Skin...
Imagine you have a large supply of 3kg and 8kg weights. How many of each weight would you need for the average (mean) of the weights to be 6kg? What other averages could you have? If you are given the mean, median and mode of five positive whole numbers, can you find the numbers? Three students had collected some data ...
CBSE Class 8 Maths Data Handling - The marks obtained by Kunal in his annual examinations are shown below: Subject Hindi English Mathematics Science Social Studies Marks 63 75 90 72 58 Draw a bar graph to represent above data. - Draw a histogram for the following data: Class Interval Frequency 0-5 4 5-10 10 10-15 18 15...
At the Mid-Atlantic Ridge (and other places), material from the upper mantle rises through the faults between oceanic plates to form new crust as the plates move away from each other. The new crust then slowly moves away from the ridge. Seafloor spreading helps explain continental drift in plate tectonics. Earlier theo...
Fission is a process by which a single neutron is absorbed by an atom, causing it to split into two fragments, releasing energy and free neutrons. The energy released from this interaction is far greater than the energy used to initiate the reaction, thus making the process highly enticing as a source of free energy fo...
Glaciologists and Earth scientists are increasingly using a technique known as micromorphology to study the sediments (gravel, sand and mud) left behind as after a glacier or ice sheet has melted away. This approach can help us understand what is happening deep beneath the icy wastes of modern polar ice sheets like Ant...
Game theory uses deceptively simple challenges to provide insights into human decision making and cooperation. Many of the challenges force players to choose between (for example) taking a small but guaranteed payoff or a big payoff that will be lost unless another individual cooperates. The games themselves are often ...
In previous optics basics posts, the interference of waves has played a major role. When two or more monochromatic (single-color) waves are combined, they form a pattern of light and dark regions, in which the combined light fields have constructively or destructively interfered, respectively. The simplest of these pat...
In this first lecture of the new section Linear Functions and Their Graphs, our instructor will cover the concepts of slope as well as rate of change. You will learn the four possible slopes: positive slope, negative slope, zero slope, or undefined slope.The slope is defined as the ratio of the 'rise' divided by the 'r...
\| Forward \| Up \| Map \| Glossary \| Information \| Expo Home \| Although he is regarded as one of the most brilliant mathematical physicists of the century, Einstein thought of himself as much as a philosopher as a scientist. Certainly his theories relating matter, energy, space, time and gravity have guided much of the wo...
This week I stumbled upon a fascinating discovery by a University of Texas paleoanthropologist named John Kappelman. He, along with Turkish and German colleagues, found a 500,000-year-old skull cap of the species homo erectus in western Turkey. The young man, because of markings on the skull, almost certainly died of t...
FORT SUMNER STATE MONUMENT._ The building complex where Navajo and Apache people were interned 1862--1868 no longer stands, but a marker details Fort history. Visitor center and Old Fort Sumner Museum features items relating to military, Native Americans, of the Long Walk, incarceration, and archaeology. In the mid-180...
The concept of Legalism was first conceived by Shang Yang around 350 BC. However, Han Feizi developed the philosophy in his self-titled book. The philosophy formed the basis of the Qin Dynasty and influenced all other dynasties. Legalism is similar to the divine right of kings, in that the legalist ruler took absolute ...
Listen to the poet reading his poem. Listen to it a few times without comment. What images or pictures are the pupils left with in their minds? Write down, before discussion, what those pictures are. In small groups, describe these mental images to each other. What are the similarities or how are they different? Talk a...
Archerfish (Toxotes jaculatrix) are famous for an unusual talent: They can shoot down above-water insects by squirting a powerful stream of water from their mouths. This ability has puzzled scientists, though, because light refraction at the water surface distorts a prey's apparent size and location. A new study sugges...
About the time, 201 million years ago, that the super-continent Pangaea – the single land mass made up of all the present continents – started to break up, life on Earth was hit by a severe crisis that killed off numerous animal species. On land, the devastation was not so bad, although many plants did wither and die. ...
Laboratory Notes for BIO 1003 © 30 August 1999, Mary Jean Holland Organic compounds contain carbon atoms linked together to form chains or rings. Four classes of organic compoundsócarbohydrates, lipids, proteins and nucleic acidsóare found in large amounts in living organisms. The chemical properties of the different c...
What is Facts for Life? Using Facts for Life Safe Motherhood and Newborn Health Child Development and Early Learning Nutrition and Growth Coughs, Colds and More Serious Illnesses Emergencies: Preparedness and Response PDF and Word versions Resources Family planning services provide men and women of childbearing age wit...
After World War Two, US Reacts to 'Iron Curtain' Across Europe Download MP3 (Right-click or option-click the link.) THE MAKING OF A NATION – a program in Special English by the Voice of America. Throughout history, power passes from one nation to another. Persia, for example, was the world's most powerful nation at the...
Science Fair Project Encyclopedia Operation Pedestal was an attempt to get vital supplies to Malta during World War 2. Previous convoys such as Harpoon (from Gibraltar) and Vigorous (from Egypt) had lost most of the merchantmen sunk and their cargoes lost and their escorts damaged. The supplies were to be carried in a ...
THINKING LIKE AN ECONOMIST BRIEF PRINCIPLES OF MACROECONOMICS By the end of this chapter, you should understand: Ø how economists apply the methods of science. Ø how assumptions and models can shed light on the world. Ø two simple models—the circular flow and the production possibilities frontier. Ø the difference betw...
By David Brakhage We’ve all heard the expression “no pain, no gain.” Usually it applies to spending time at the gym or putting in extra effort to reach a remote duck hunting spot. But the expression also applies to wetlands and their need to endure occasional drought to remain productive. Wetlands are among nature’s mo...
Skeleton of Sciurumimus albersdoerferi on a limestone slab. (H. Tischlinger/Jura Museum…) A 135-million-year-old fossil of a juvenile dinosaur found in Bavaria suggests that most carnivorous dinosaurs may have been covered in feathers. Paleontologists had already known that many dinosaurs closely related to birds were ...
Baby birds can be a challenge to identify as they grow, often changing feather lengths, colors and markings in just a few days. Many birders have been both confused and excited by finding a young bird they didn’t initially recognize, hoping it is a new species to add to their life list, but if you understand how baby b...
A NASA robot designed to melt its way through thousands of metres of ice to collect data and images from subsurface oceans has undergone its first successful test in the Arctic. The robot - named Cryobot - could eventually be used to explore the polar ice caps of Mars and delve down beneath the icy crust of Jupiter's m...
How does a Last week, we explored magnets and how they work. This week we will explain how a compass works. When you put a magnet near metal, an invisible force pulls the metal to the magnet. This invisible force is called magnetism. In many ways, Earth acts like it has a big bar magnet buried In order for the north en...
- What is a Cetacean? - Common Species - Rare Species - Other Species Key FactsLength: Up to 18 metres Range: Atlantic Ocean Threats: Ship strikes, pollution North Atlantic Right Whale Latin: Eubalaena glacialis The North Atlantic right whale is a large, robust-bodied animal that can measure up to 18 metres in length. ...
Ebola Hemorrhagic Fever (Ebola HF) (cont.) In this Article - What is Ebola hemorrhagic fever? - Where is Ebola virus found in nature? - Where do cases of Ebola hemorrhagic fever occur? - How is Ebola virus transmitted? - What are Ebola hemorrhagic fever symptoms and signs? - How is Ebola hemorrhagic fever clinically di...
view a plan Here is a lesson on clouds Topic : Cloud Formation Grade Level : Fourth Concept : Cloud formation results when warm, humid air rises and cools, causing the water vapor in the air to condense and form clouds. Teacher Materials : –a large jar –a plastic bag of ice that will fit over the jar opening –a pitcher...
The Tragedie of Hamlet, Prince of Denmark - A Study with the Text of the Folio of 1623 William Shakespeare's HAMLET A modern English version William Shakespeare's Hamlet is explained in modern English. This document is meant to help explain the idea behind Hamlet, a play by William Shakespeare, who originally wrote Ham...
A Federal Reserve Note is essentially the official paper currency of the United States. Federal reserve notes, or dollar bills, are printed by the U.S. Treasury under the instruction of Federal Reserve member banks. These banks also serve as a clearinghouse for smaller, local banks where checks and bills are exchanged ...
"Differential sail" seems to be a term for a surface that when put in some uniform (meaning homogeneous and isotropic) bath of particles (including light, which you can think of as being composed of particles) will indefinitely produce a force in one direction without using additional energy. It seems this is generally...
A tsunami is a powerful wave, usually created by a large-scale motion of the ocean floor. Although they are almost imperceptible at sea, tsunami waves increase in height as they reach a coastline and are capable of causing great destruction. The term "tsunami" is taken from the Japanese words for "harbor" and "wave." I...
Minilessons for Early Multiplication and Division Contents and Overview Minilessons for Extending Multiplication and Division Contents and Overview Minilessons for Early Multiplication and Division is a resource of 75 minilessons that you can choose from throughout the year. In contrast to investigations, which constit...
HTTP vs. HTTPS Difference beetween http:// and https:// HTTP (Hyper-Text Transfer Protocol) is defined in RFC 2616 (request for comments). HTTP is a distributed, joint, hypermedia information system’s protocol at an application level. The negotiation part of data transfer is the main characteristic of HTTP. Web server ...
Writing style, that is made from wedge-shaped strokes, inscribed on clay, stone, metal, wax or other materials. Cuneiform writing has been used in several languages, and was in use for about 3,000 years, from about 3100 BCE until about year 0. Cuneiform writing originated in southern Mesopotamia, and was created in the...
By Aristotle Socrates The desire to discover distant, rare, and strange objects dominated twentieth-century astronomy, for which increasingly larger and more sensitive telescopes were constructed. The act of carrying out this objective has brought enormous—and somewhat unbelievable—rewards: We now accept that we orbit ...
History of the World Grid Theory The idea of the Earth as a geometric shape goes back in history at least to the Pythagorean school of thinking in ancient Greece. Its famous adherent, Plato, wrote that ‘the earth, viewed from above, resembles a ball sewn from twelve pieces of skin. The octahedron, tetrahedron, icosahed...
Why Audio Clips? Why use them? Who benefits? - All students need to learn and practice listening skills. Basic skills include: - Identifying main ideas - Recalling details - Sequencing events - Drawing conclusions - Identifying perspectives - Predicting outcomes - Practicing these literacy skills in the context of list...
Bats rely on their hearing more than any other mammal. After all, bats navigate the night sky by hearing the results of their echolocation, their natural sonar system. Turns out that's just the beginning of what makes bat-hearing amazing. In order to better hear the returning ultrasonic pulses that they send out, bats ...
According to an analysis by UNU-PREP and the Japan-based UNU Institute for Advanced Studies: "While large parts of the Pantanal have remained pristine, today the ecosystem is under unprecedented pressure from economic development, alterations of its water courses and conversion to other land uses." "Moreover, global cl...
LOGARITHMS. A tabular system of num bers, by which multiplication can be performed by addition, division by subtraction, involution by a single multiplication, and evolution by a single division. The logarithm of a number is the exponent of the base which produces the number. if am = b, x is said to be the logarithm of...
The enemy within is a nonfiction historical account of the development of witch hunts both in Europe and in the American colonies. The author is John Demos who is a professor of history at Yale University and is the author of several articles and books on American history. The early European development of witch craft ...
L’Encyclopédie de l’histoire du Québec / The Quebec History Encyclopedia History of the Postal System of Canada [This article was published in 1948; for the full citation, see the end of the document] Post Office. During the French régime there was no postal service in Canada, except a system of official couriers, esta...
The Ulysses spacecraft was designed for solar study and used a gravity assist from flying close to Jupiter to change its inclination (the tilt of its path relative to the plane of the planets) so it can fly over the poles of the Sun. In July 1994 it will be about 378 million km south of the plane of the planets (the ec...
Cooperative Learning is a wonderful tool for any teacher to have in their toolbox. There are many different strategies to cooperative learning. No matter what strategy you are using, there are five basic standards. They are: - Practice Active Listening - Help and Encourage Each Other - Everyone Participates - Explain Y...
posted by Nina . what the United States may have looked like had the Anti-Federalists "won" their points in the ratification debate and the writing of the Constitution If the Anti-Federalists "won" their points in the ratification debate and in the writing of the Constitution, the United States would have undoubtedly l...
On October 25, 2006—ten years ago—NASA strapped two satellites onto a Delta II rocket and sent them skyward with an important mission—to figure out what our Sun is all about. Given that it’s the brightest object in our solar system and the big ball of fire that keeps us alive, you’d think humans would know all kinds of...
Guest Author - Celestine A. Jones Children receiving special education services often have disabilities that require extra help in retaining information. Effective instruction can aid the student in retaining the information. There are two types of information. They are essential and supplemental. Essential information...
The Civil War was at its roots a clash of cultures. The North was an industrialized sophisticated society while the South was an agrarian nearly feudal society. Psychologically they were completely at odds with each other. Politically the war was fought over the issue of "States Rights." Since the signing of the Consti...
This module revisits trigonometry that was introduced in Geometry and Algebra II, uniting and further expanding the ideas of right triangle trigonometry and the unit circle. New tools are introduced for solving geometric and modeling problems through the power of trigonometry. Students explore sine, cosine, and tangent...
ExploraTour - How to Build a Star Stars generate power through nuclear fusion. Fusion is the joining together of light nuclei to form a heavier nucleus. The heavier nucleus has less mass than the combined mass of the lighter nuclei. The missing mass is converted into energy. In the sun, hydrogen nuclei are being fused ...
The Normans Anglo-Norman The Normans, also known as the Norsemen, are a group of people who captured England and formed colonies in Normandy. They played a crucial role in both the cultural, political, and military affairs in the region. Their influence spread as far as the Mediterranean, and they are primarily known f...
For 2-4 year-olds - give your child time to look at the pictures before you read - ask, 'Where's the...?' 'What's that called?' 'What's she doing?' - always follow text with your finger as you read - with familiar stories, see if your child can join in or finish phrases - ask questions like: 'Why did he do that?' 'What...
Nunavut premier Paul Okalik took the lead in this regard in a First Ministers meeting discussing the Kyoto Accord. The Metis are an ethic group of the Canadian prairies and Ontario. These communities of descent consist of individuals descended from marriages of Cree, Ojibway and Saulteaux women to French Canadian and B...
Narration is an important evaluation tool. Learn why you should use it, how to incorporate it in your homeschool, and narration suggestions. What is narration? In a Charlotte Mason education, narration is the primary method of evaluating what your child has learned. It is telling what you heard, read, or studied in you...
There's nothing like math to lend itself to a hands-on lesson. Math skills can be developed through all kinds of activities – while playing with blocks, drawing shapes, or building a playhouse through trial and error. Use these activities as-is, or as jumping off points for your own lessons. Each activity makes use of ...
A-level Mathematics/Edexcel/Core 1/Integration Basics of integration Integration is the opposite of differentiation. For a power of x, you add 1 to the power, divide by the new power and add c, the constant of integration. Note that this rule will not work when the power of x is -1, this requires more advanced methods....
The Spelling Level A Teacher's Manual teaches spelling with short and long vowel sounds. It provides instruction for using the Spelling Level A Workbook. Spelling lists follow phonics themes and feature many common sight words. Activities highlight spelling rules for: - adding suffixes, - using spelling words in senten...
What is chronic fatigue syndrome (CFS)? Chronic fatigue syndrome (CFS) is an illness characterized by prolonged, debilitating fatigue and multiple nonspecific symptoms such as headaches, recurrent sore throats, muscle and joint pains, memory and concentration difficulties. Profound fatigue, the hallmark of the disorder...
A pronoun is a word that is used to substitute for a noun or a noun-phrase. The pronoun refers to a person or a thing that is understood from the context of the sentence. There are eight distinct types of pronouns. The Fantasy author will use all of them, but understanding why can help with successful writing. The eigh...
How to Write an Elegy An elegy is a poem lamenting the loss of a someone or something special. Unlike an ode, which is a poem of praise, an elegy is a poem of mourning that describes three stages of grief: sorrow, admiration and acceptance. Elegies can be written for a specific loved one, a famous figure or an event th...
For the definition and checklist, link with these sites: National Standards Organizations National Content Standards To help students in grades 6-8 understand how the history, culture, and geography of an area influence a person’s perception, students immerse themselves in role-playing as either Palestinians, Jews, or ...
Some people get sick watching 3D movies because the signals sent from the eyes to the brain do not match the signals sent from the inner ear. The eyes are reporting motion, yet the inner ear does not sense any motion, and thus the body becomes confused and nauseous.Continue Reading The inner ear contains a small sectio...
Petr stands in line of n people, but he doesn't know exactly which position he occupies. He can say that there are no less than a people standing in front of him and no more than b people standing behind him. Find the number of different positions Petr can occupy. The only line contains three integers n, a and b (0 ≤ a...
There is some variability up and down, but the trend is clearly up, and quickly accelerating. It doesn’t seem like much, but we can clearly see the effects of the warmer temperatures, including shrinking ice sheets, declining Arctic ice, and retreating glaciers all over the world. As a result of shrinking ice sheets, r...
There are several theories on language acquisition. During our first years of life, the human brain develops rapidly. Many things take place as we learn to speak and understand language. In this article we will look at some of the most widely accepted theories in psycho-linguistics of how we learn languages. Theory of ...
In this essay our goal was to prove that any random quadrilateral's perpendicular bisectors would produce another figure whose perpendicular bisectors would produce yet another quadrilateral which is similar to the original quadrilateral. To prove this statement correct, it was necessary for us to apply many of the con...
Identifying the composition of the earth's core is key to understanding how our planet formed and the current behavior of its interior. While it has been known for many years that iron is the main element in the core, many questions have remained about just how iron behaves under the conditions found deep in the earth....
Australian scientists have crossed a popular variety of wheat with an ancient species, producing a salt-tolerant variety they say could help reduce food shortages in the world’s arid and semi-arid regions. Using a genetic variation that had been lost in plants due to domestication before it was rediscovered a decade ag...
One of the most important aspects of early music appreciation and education is the understanding of musical form. While the concepts of structure within music may seem like complicated ideas for children to gain a mastery of, basics of formal analysis can be presented to children using techniques and examples on their ...
The treaty has been broken on several occasions but it introduced the notion of 'crime against peace' which was used during the Nuremberg Trials following WW2. Facts about Kellogg-Briand Pact Following WW1 (28 July, 1914 - 11 November, 1918), the Washington Conference (1921 - 1922) was hailed as a great accomplishment ...
What is CBT? Cognitive Behavioral Therapy is a problem-focused type of intervention. Rather than an in-depth focus on past experience, cognitive behavioral therapy (or CBT) seeks to teach children to become their own therapist. CBT helps kids recognize their thought patterns and identify where and when those patterns h...
What are the functions of elections in promoting democracy? - Representation - In a representative democracy, elections are the means by which a large group (the electorate) selects a much smaller group - representatives or MP's to act on its behalf, and in doing so identify who should be in government. - Participation...
why germany hated the treaty of versailles Germany had to accept total responsibility for starting the First World War. this was called the War Guilt Clause or Article 231. Germany had to pay £6,600 million in reparations to cover war damages and other Allied losses. The German army was to have no more than 100,000 men...
A common finding in children with auditory processing disorder (APD) is a left-ear deficit on dichotic speech tasks. A 1998 study demonstrated significant improvement in binaural listening tasks and academic performance when dichotic training tasks were incorporated into the auditory training program.1 Pre-training, th...
Natives of the inhospitable southwestern United States and northern Mexico, the Apache were nomadic people who built their society on a balance of commerce and raids. Thanks in part to their nomadic lifestyle and harsh homeland, the Apache were considered among the most formidable mounted warriors of the southwest. The...
Many species of owl are able to hunt in effective silence by suppressing their noise at sound frequencies above 1.6 kilohertz (kHz) – over the range that can be heard by humans. A team of researchers studying the acoustics of owl flight –including Justin W. Jaworski, assistant professor of mechanical engineering and me...
A new study carried out on the floor of Pacific Ocean provides the most detailed view yet of how the earth’s mantle flows beneath the ocean’s tectonic plates. The findings, published in the journal Nature, appear to upend a common belief that the strongest deformation in the mantle is controlled by large-scale movement...
The Uncertain Speed of Light by Henry M. Morris, Ph.D. One of the most frequent questions encountered by those of us who believe in the literal Genesis record of creation is: "How can the universe be young if the stars are old? If a star is, say, a million light-years from Earth, wouldn't it take a million years for it...
Aspasia ( c. 470 BC – c. 400 BC) was an influential immigrant to Athens who was the lover and partner of the statesman Pericles. The couple had a son Pericles the Young, but the full details of the couple's marital status are unknown. According to Plutarch, her house became an intellectual centre in Athens, attracting ...
Making Sense of Math: Thinking Rationally. Amy Lewis Math Specialist IU1 Center for STEM Education. Goals for the course. Use a variety of tools to deepen their understanding of rational numbers and explore proportional relationships to connect fractional meanings and representations. IU1 Center for STEM Education Stud...
Ferdinand Magellan (1480–1521) Episode #5 of the course “Europe’s greatest explorers” Ferdinand Magellan was a Portuguese nobleman and sailor who led the first European expedition to circumnavigate the globe. Born in Portugal, Magellan began serving as a page in the queen’s court at age 10. As an adult, Magellan became...
For a Montessori school, there are principles that are meant to be maintained throughout every activity. The activities should be student selected, guided by teachers, they should encourage creativity, and be completed in an open and judgement free setting. When one thinks of activities for toddlers, art and outdoor pl...
Brazilian Patricia Medici knows how to catch a tapir. Argentinian Juan Pablo Juliá knows how to let one go. Both biologists are involved in projects that aim to better understand this reclusive and strange-looking animal, the largest mammal in Neotropical forests, and save it from extinction. Medici and Juliá are study...
The Outer Ear: The outer ear consists of the visible part of our ear (the auricle) and the ear canal. What we call ‘noises’ are actually just ‘sound waves’ which are transmitted by the air. These sound waves are collected and guided through the ear canal to the eardrum. The eardrum is a flexible, circular membrane that...
Prefixes and Suffixes are affixed to the beginning or end of a root word and add information. Prefixes are added to the beginning of a root word as in reread with the prefix “re” meaning to do over. Suffixes are added to the end of a root word and can change the word’s plurality, tense or even form a new word. The two ...
There are many great resources available for educators and youth to learn about invasive species in BC. Click on the blue titles to download the files. New Youth Activities in 2017 Follow the links to download the newly launched resources: Attention Teachers! Enjoy these resources for each grade level: - Invasive Speci...
Readers get to know literary characters through the descriptions of their appearance and actions, their speech patterns in dialog with other characters and themselves, observations/statements by other characters (or the narrator), and sometimes directly from the character’s thoughts and emotions. The art behind this in...
As much of the United States shivers through a cold spell, readers may be hard pressed to remember the summer heat waves that have been coming in increasing frequency. The southwestern U.S. baked during this past summer. High heat in the Midwest and East Coast in summer 2012 killed 82 people, which followed a record su...
How do scientists working on the SETI program expect to get clear and intelligeble signals from aliens in other solar systemes,when tv and some radio stations sygnals become distoreted and unubtainable after short distances on earth? Wouldn't the vast distances of interstellar space have same effect on tv and radio sig...
What is BMI? BMI stands for Body Mass Index. It is tool used to calculate if you are carrying the correct body weight for your height. It is said to estimate the total amount of body fat you are carrying. It does not measure the weight of bones, muscle an organs. The idea of calculating a person’s BMI is to work out if...
The Odyssey lesson plan is a four-week, day-to-day plan. The Odyssey has the reputation of being a difficult text to teach, in part because of its size. But in reality the book is both manageable and completely enjoyable. For this lesson plan, students read the majority of the text in small groups, with each group assi...
LAKE VOSTOK, Antarctica -- Lying beneath more than two miles of Antarctic ice, Lake Vostok may be the best-known and largest subglacial lake in the world, but it is not alone down there. Scientists have identified more than 145 other lakes trapped under the ice. Until now, however, none have approached Vostok's size or...
To the Teacher An essential foundation of secondary school geometry is the concept of angle. Many students do not have enough experience with angles when, at the beginning of a geometry class, we tell them how to use a protractor. Often, we are surprised at how difficult this idea is for many students. I have banged my...
The history of India begins with evidence of human activity of Homo sapiens as long as 75,000 years ago, or with earlier hominids including Homo erectus from about 500,000 years ago. The Indus Valley Civilization, which spread and flourished in the northwestern part of the Indian subcontinent from c. 3300 to 1300 BCE, ...

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